Resource and element names are case-sensitive.

• A. True
• B. False
• C. Not specified
• D. Depends on version

Answer: (A)

Resource and element names are case-sensitive. In FHIR, every resource type name (for example, Patient, Observation) and every element name (such as id, meta, birthDate, gender) is defined with exact capitalization. When you serialize a resource in JSON or XML, the keys must match exactly; a different capitalization means the processor won’t recognize the field and validation can fail. For example, the resourceType must be "Patient" with a capital P, and "birthDate" uses lowerCamelCase. If you write "BirthDate" or "birthdate," the system won’t treat it as the birthDate element. This rule holds across FHIR versions, so it is not version-dependent.